EP0366852B1 - Bobine de deflection compensée pour tubes à rayons cathodiques - Google Patents

Bobine de deflection compensée pour tubes à rayons cathodiques Download PDF

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Publication number
EP0366852B1
EP0366852B1 EP88830518A EP88830518A EP0366852B1 EP 0366852 B1 EP0366852 B1 EP 0366852B1 EP 88830518 A EP88830518 A EP 88830518A EP 88830518 A EP88830518 A EP 88830518A EP 0366852 B1 EP0366852 B1 EP 0366852B1
Authority
EP
European Patent Office
Prior art keywords
support plates
yoke
coils
holding ring
plastic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88830518A
Other languages
German (de)
English (en)
Other versions
EP0366852A3 (en
EP0366852A2 (fr
Inventor
Emilio Germani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eldor Corporation SpA
Original Assignee
Eldor Corporation SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eldor Corporation SpA filed Critical Eldor Corporation SpA
Publication of EP0366852A2 publication Critical patent/EP0366852A2/fr
Publication of EP0366852A3 publication Critical patent/EP0366852A3/en
Application granted granted Critical
Publication of EP0366852B1 publication Critical patent/EP0366852B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/003—Arrangements for eliminating unwanted electromagnetic effects, e.g. demagnetisation arrangements, shielding coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements
    • H01J29/823—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements around the neck of the tube
    • H01J29/826—Deflection arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
    • H01J2229/0015—Preventing or cancelling fields leaving the enclosure

Definitions

  • the present invention relates to a deflection yoke compensated for electromagnetic radiations for a cathode-ray tube.
  • a compensating system provided with a bucking coil consisting of some turns of copper wire wound in the air, held together by some turns of insulating tape and fastened to the yoke partly by welding the terminals thereof to the yoke contacts and partly by means of silicone cements.
  • handicraft type which generally exhibit the same structure as the one described above.
  • a deflection yoke compensated for electromagnetic radiation in a cathode-ray tube characterized in that it comprises a yoke body (1), a plastic magnet-holding ring (1a) mounted to the widest circular base portion of said yoke body, and two plastic support plates (2) mounted simmetrically to the magnet holding ring in register to the north and south sides of the yoke and preferably of polygonal form with rounded edges and mounted preferably at right angles to the plane of the magnet holding ring, provided each with hooks (3) disposed at right angles to and on the symmetric ends of said support plates and designed to snap-fit bucking coils (4), and provided further with plastic pins (5) so disposed that they project with respect to said ends of the support plates (2) and are disigned to secure the coil terminals (4a, 4b), said pins preferably support and connect parallel to the coils a dampening circuit consisting of
  • 1 denotes the yoke body taken as a whole, and 1a a plastic magnet-holding ring mounted to the widest circular base portion of the yoke body 1.
  • two plastic support plates are mounted as, shown in top view in the figure and identified by reference numeral 2.
  • Said plastic support plates are provided with hooks 3 around which bucking coils 4 can be wound.
  • the ends 4a and 4b of said bucking coils are fastened to pins 5 which, as more clearly shown in Fig. 2, are designed to support a dampening circuit which consists of a resistor 6 connected in series to a capacitor 7.
  • the plastic support plates are in the form of a polygon with rounded edges, as clearly seen in Fig. 2.
  • the plastic support plates 2 are disposed at right angles to the plane of the magnet-holding ring 1a of yoke 1 and symmetrically in register with the north and south sides of said yoke.
  • the perpendicular condition of said support plates with respect to the plane of magnet-holding ring 1a is not compulsory, but if a necessity of electromagnetic nature for the compensation arises, said support plates are positioned at an angle to said plane of the magnet-holding ring of said yoke body, depending on the compensation to be achieved.
  • the support plates 2 can also have different suitably shaped forms in order to optimize the required compensation.
  • Yoke body 1 provided with plastic support plates 2, is equipped with bucking coils 4 which are connected in parallel to each other and then in series with the horizontal winding of the yoke or in any other manner.
  • Bucking coils 4 are made of self-cementing copper wire and are wound by an appropriate winding machine around a former intended for the purpose. For the above reasons they do not need wound around bands to ensure the cohesion of wires and therefore their arrangement on the structure of the yoke body 1, and as a result on the plastic support plates 2, is surely rigid and very reliable against any impact or shake.
  • the number of turns in the bucking coils obviously depends on the number of turns in the horizontal deflection coils and on the degree of compensation to be achieved.
  • the two pins to which terminals 4a and 4b of bucking coil 4 are fastened also allow a dampening circuit to be added each time it is necessary, said circuit consisting of a resistor connected in series to a capacitor, to resist the parasitic oscillations generated by the bucking coil.
  • the invention thus attains the intended purposes.
  • the present deflection yoke used for a cathode-ray tube exhibit a low radiated electromagnetic field intensity which is just reached by virtue of the use of bucking coils 4 directly mounted to the yoke body 1 on the above described plastic support plates 2 which are incorporated in the circular base portion of yoke 1 representing the plastic magnet-holding ring 1a.
  • the present bucking coils allow an important saving in manufacture and ensure a high production rate as compared to any other type of embodiment.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Details Of Television Scanning (AREA)

Claims (4)

  1. Bobine de déflection pour un tube à rayons cathodiques effectuant une action de compensation vis-à-vis de la radiation électromagnétique, caractérisée en ce qu'elle comporte un corps de bobine (1), une bague porte-aimant en matière plastique (1a) montée sur la portion de base circulaire la plus large dudit corps de bobine, et deux plaques de support (2) de matière plastique montées symétriques avec la bague porte-aimant en correspondance des côtés nord et sud de la bobine et de préférence de forme polygonale aux bords arrondis, et disposées de préférence perpendiculaires au plan de la bobine, chacune de ces plaques étant pourvue de crochets (3) disposés perpendiculairement avec et aux extrémités symétriques des plaques elles-mêmes de support et destinés à se fixer par encliquetage à des bobines de compensation (4), et étant également pourvue de tétons de matière plastique (5) disposés de manière à faire saillie par rapport aux extrémités des mêmes plaques de support (2) et destinés a la fixation des bornes (4a, 4b) desdites bobines (4); lesdits tétons supportent et relient en parallèle aux bobines un circuit d'amortissement comportant une résistance (6) reliée en série à un condensateur (7), lesdites bobine de compensation (4) ayant un nombre variable de spires en fonction de la compensation qu'on désire obtenir.
  2. Bobine de déflection selon la revendication 1, caractérisée en ce que lesdites plaques de support (2) en matière plastique sont positionnées suivant un angle variable par rapport au plan de la bague porte-aimant dudit corps de bobine, en fonction de la compensation qu'on désire obtenir.
  3. Bobine de déflection selon la revendication 1, caractérisée en ce que lesdites plaques de support en matière plastique (2) ont des formes polygonales différentes en fonction de l'effet de compensation qu'on désire obtenir des bobines.
  4. Bobine de déflection selon la revendication 1, caractérisée en ce que lesdites bobines de compensation (4) sont faites en fil de cuivre à cimentation automatique et sont enroulées automatiquement par des machines à bobiner.
EP88830518A 1988-10-31 1988-12-02 Bobine de deflection compensée pour tubes à rayons cathodiques Expired - Lifetime EP0366852B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2247588 1988-10-31
IT8822475A IT1227963B (it) 1988-10-31 1988-10-31 Giogo di deflessione compensato per tubi a raggi catodici

Publications (3)

Publication Number Publication Date
EP0366852A2 EP0366852A2 (fr) 1990-05-09
EP0366852A3 EP0366852A3 (en) 1990-12-27
EP0366852B1 true EP0366852B1 (fr) 1994-03-30

Family

ID=11196778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88830518A Expired - Lifetime EP0366852B1 (fr) 1988-10-31 1988-12-02 Bobine de deflection compensée pour tubes à rayons cathodiques

Country Status (7)

Country Link
US (1) US5036246A (fr)
EP (1) EP0366852B1 (fr)
JP (1) JPH02123647A (fr)
DE (1) DE3888833D1 (fr)
FI (1) FI885546A7 (fr)
IT (1) IT1227963B (fr)
NO (1) NO885344L (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR920006867Y1 (ko) * 1990-11-22 1992-09-28 삼성전관 주식회사 편향 요크의 자성편의 취부구조
JP2575394Y2 (ja) * 1992-12-30 1998-06-25 株式会社村田製作所 偏向ヨーク装置
JPH087791A (ja) * 1994-06-17 1996-01-12 Sony Corp 漏洩磁束キャンセル装置
EP0690471B1 (fr) * 1994-07-01 1998-11-18 THOMSON TUBES & DISPLAYS S.A. Système de déviation des faisceaux électroniques pour tube à rayons cathodiques
JP3718278B2 (ja) * 1996-02-29 2005-11-24 株式会社東芝 偏向装置
US5861711A (en) * 1996-03-28 1999-01-19 Samsung Electronics Co., Ltd. Deflection yoke mounting device of the spray

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428947A (en) * 1945-01-31 1947-10-14 Rca Corp Deflection device for cathode-ray tubes
US3950720A (en) * 1975-01-07 1976-04-13 Rca Corporation Adjustable spring mount for a cathode ray tube yoke
US3939447A (en) * 1975-01-07 1976-02-17 Rca Corporation Spring mount for a cathode ray tube yoke
JPS6237849A (ja) * 1985-08-09 1987-02-18 Denki Onkyo Co Ltd 偏向ヨ−ク装置
JPH01175151A (ja) * 1987-12-29 1989-07-11 Sony Corp 偏向ヨーク

Also Published As

Publication number Publication date
FI885546A7 (fi) 1990-05-01
FI885546A0 (fi) 1988-11-29
JPH02123647A (ja) 1990-05-11
DE3888833D1 (de) 1994-05-05
IT1227963B (it) 1991-05-20
IT8822475A0 (it) 1988-10-31
NO885344L (no) 1990-05-02
NO885344D0 (no) 1988-11-30
EP0366852A3 (en) 1990-12-27
EP0366852A2 (fr) 1990-05-09
US5036246A (en) 1991-07-30

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